Carbureter.



H. H. BAER. caunsf.'

y APPLCATiON 'lLEU OCT. 27. 19|?. 1,277,173. Patented Aug. 27, 191s.

FIJ-7.1

, 1 51's Hiking.

i c Yeong 4 Patented Aug. 27; 1918.1

, one of said {unisi-and then"to feed the other` l ohangingg from the one toV UNITED STATES PATENT OFFICE.

HARRY-H. BAER; OF CLEVLAND, OHIO,

CARBURETER.

Specification of Letters Yatent.

Patented Aug. 27, 1918.

Application led October 27, 1917. Serial No4 198,778`

utilization' of both gasolene -and kerosene 0*:5

any ytwo volatile:hydrocarbons varying in density or specifici. gravit comprises means where y the operator is enabled to the engine-by theuse of offaidpfuel' mili in tfolves 'the use of two r'eslibureting elianiber of the d fAvriotlierfjzobj t'i'sto fao; pedite 't-liecminingling'of the'pfuel and air suppl-led to 'the' carburetingrchamber and to inorefrapidlyand thoroughly vaporize the fuel within said chamber.

`"i nother obj ect is 'tn ,provide lmeans whereby asnpplyof air tolan air-,and-fnel mixture in the, carburetingehalnber is antof matically varied as required in shifting or the other' fuel during the"'operation of n n internalV com# bus-tion engine; i

Another object isto facilitate tbe assombla we of the component pa rt?` of a carburetor of the character indicated and to render the carburetor simpleand durable in construction, reliable in its operationl and not liable to get. out of.order.

Vith these objects in view, and to attain any'l other object hereinafter appearing, this invention consists in rortain features of ronstruction, and combinations and relative aror otherwise and` ber `11 iff. supplied withjgasbl riefV a :chamber 12 with kero'senQ ,l dientes the level of the {nel-body'af'desiredi'f to he maintained infn-aid chambers. f

litilte and eltrangenu-nt of the parts. hereinafter doscrihod in thisl spoeitiration. pointed out in the claims and illust rated in the accompanyin drawin n said dawings, Figure l is a central vertical section of a carbureter embodying my invention. Fig. 2 is a horizontal section taken along the line ZM?, Fig. 1. lFig. 3 is a horizontal section taken along the line :1i-, Figi 1. Ei'fr. 4 is a verticalsection taken along the line 4-4, Fig. 1. Fig. 5

is a-vertical section of a portion of the car-l onds with the correb ureter and roi-res .sponding portion il ustrated in' F' 1, ex- ;epftfiis to the position'of` the fueleed-controlling val vcnd mov-ablepiirts operatively connectecPwith said valve.-

In said drawings, A' indicates' thel bod of -a'carbureter embodying my invention, w vich "body4 is preferably :composed of lnetal castin iVithinSaldbbdy v re r 10 and two, fjl b ninbers A11 and 12. The ainchamber '.l- "d 'i'termediatoly of `the lower @aj single ed. gf"

I S theref therIfuelA-chainberal 1 1 :Tan

Each furl-chamber is provided at. the bot,- toin with a fuel-intake 14, an'd'B indicates a pipe fox-conducting fuel toj'said intake from a fuel-supply source (nothqwn). The

soV

ln-l' und shown horizontally' pivted 0l' fulcrumod. as at 15. rentriilly between the ends of the h-vrr. to an externally-Screw-threaded head E which is screwed into the body-A of the carburetor and, forms a removable iop or rover for said chamber, and a float G is suspended lfrom the opposite ond of' Said lover and arranged within Said Chamber. 1t will be observed therefore that the ed in said body-portion ofthe nozzle.

sis

-the carbureterand the ducts 16 and permits fuel to flow into said chamber at the intake 14 of the chamber until theA desired level of fuel has again been restored in the chamber by the ascent of the float into its valve-closing position shown in F ig. 1.

Each fuel-chamber is in communication near its lower extremity with a horizontall-y arranged duct 16 formed in the-body A of leading from the two fuel-chambers are preferably substantial] in line endwise, as shown in Figs. 1 an( 5, and connect. with a substantially horizontal valve-containing bore 17 formed centrally and arranged transversely of the body-portion 18, of a fuelfeeding nozzle arranged internally of the air-chamber 10. The body-port ion 18 of the nozzle extends therefore transversely of the air-chamber 10 and is' preferably inte ral .with the bod-y A of the carbureter', an indicates a'rotatable horizontally arranged plug-valveoccupyi g the bore 17 and conv sequently arranged lransversely of and seat- Said nozzle has anA upwardly projecting member 19 arranged centrallyof the air-chamber 104 and having ,two spaced passages 2O and 21 connecting with the bore 17 inV the bodyportion oft-the nozzle and extending from said bore to the upper end of said upwardly;

projecting member of the nozzle and discharging upwardly into the mixing or car- I A burctin chamber 22 of the carbureter. The

' yalve a bi-way-A vulve havin two angular ports, 23 and 24, und the re atiyearrau ement of said aorts, the passages 20 and 21 in the'upward y projectm1r member of the nozzle and the ducts 16 leading from the fuel-chambers 11 and 12 is such that upon the rotationof said valve the required extent in one direction the port 23 i`u.the valve establishes communication between the passage 20 in the nozzle and the fuel-conducting duct 16 leading from the chamber 11, as shown in Fig. 1, andthat upon the rotation of the valve ,the required extent in theopposite direction the port 24 in the valveV establishes communication between the passage 21 in the nozzle and-the fuel-conducting duet 16 leading from the chamber V12as slibwn in Fig. 5. l would here remark that the body A of the cau'bureter'extends farther downwardly at one side of the air-chamber 10 than at'the opposite, side of said chamber so as toiform a lateral abutment for a dishshaped member I arranged to form the bottom of said chamber, and that said member I is provided with the air-intake 26 for said chamber, and said intake communicates with a pipe 27 for supplying warm air at said in- 'ducts, and that arm 31 is of the construction hereinbefore described it.

will be observed that my improved carbureter comprises two ducts 16 for conducting fuel to be fed to the carbureting chamber 22 from different fuel-supply sources, .that a fuel-feeding nozzle is arranged to discharge into said chamber and comprises a valve or fuel-feed-controlling means arranged and adapted to be operated to establish communication through said nozzle between said chamber and the one or he other` of said the'air--c iamber 10 and its air-intake 2G and the pipe 27 constitute 'means for supplying air to the carbureting chamber adjacent and around the dischargimr end of said nozzle. v

he plug-valve H (see Figs. 'and 4) extends through the body-portion 18 of the nozzle and is provided centrally of its diametrically smaller end with an axial stem 30 which extends externally of `the body A fof the carbureter. The valve-stem 30 isprovided at' its outer end lwith an .u waidly projecting arm 31 which ishspacedrom the body A of the 'carbureter and extends between two spaced arms or membersA 32 rigid with and projecting laterally and outwar 1y from said body 'A- and' arranged .to coperate with said arm of said valve-stem'in limiting rotation 'o'f saidvalve in opposite directions res ctlvely.' The Vrelative arran ement of t e arts is such that the` valve I is in the position lshown. in Fig.y 1 and, establishes communication: between the carbureting'chamber and the duct 16 leading from the gaslene-chumber l11, or is in the positionV shown in Fig. 5 and establishes -communicatiop between the carburetin chamber'and the duct 16 `leading from tie kerosene-chamber 12, according as the arm 31 vof the valve-stem 30 has been actuated against the one or the other of the stopformin'gmcmbers 32.- Upon installing my improved carbureter in an automobile said course operatively connected in any a proved manner with a lever (not shown within reach of the operator. I would also remark that preferably a helical spring 33 is mounted on the valve-stem 30 between the arm 31 of saidstem and the body Aoi' the curbureter andacts to retain the valve Hin proper engagement with its seat in the body-portion 18 of the nozzle.

It will also be observed that said valve is provided at its diametrically'larger end with a laterally projectingmrm 34 for the purpose hereinafter appearing.

The mixing or carbureting chamber 22 is formed above or forward of the discharging end of the fuel-feeding nozzle and internally portion ofthe; surrounding iwal] df the airof a substantially vertically arranged tubular member K, and thc upper part of -said member K is larger diametrically than the lower part of said member, and said member K is seated, as at 3G, at the lower end of its upper and diametricalhI larger part on the body A of the carburetor. The lower..and diametrically smaller part of said member K depends into said body A and hast-he portion thereof which extends upwardly rom adjacent the discharging endLof the f1 lol -feed ing nozzle considerably smaller diam'etrically than the` upper part of said member K and not much larger in diameter than but arranged concentrically relative to said end of said nozzle. The carbureting chamber 2i! is therefore considerably smaller transwrsely adjacent. and next above or forward of said end of said nozzle than above the body A of the carburetor, and I would here remark .that the lower end-portion 37 of the lower part of the member'K extends and flares downwardly around the upper portion of the upwardly` projecting member 19 of said nozzle and foims'the upper endchamber 10. `The member K` (see Fig. 4;) is secured tothe body A preferably removably by a screwv'38, and composed preferably of a singlemetal casting.

A beating chamber 4Q 's formed in the body A around and` next externally of the lower part vofthe memberK and conse- -quentlyaround kthe lower yport-'ion and externally of the earbureting chamber 'and around the upper portion and externally of the airchamher 10,` and is `in communication, as at 41, with a heating har'nber 42 .formed in said bod)r A and externally of tte kerosene-chamber 12. A pipe43, such.l for instance, as the exhaust-pipe leading from the engine, is arranged to supply a heat'ng agent to the chamber 42, and au outletipe 4A: leads from the chamber 40. The heating of the' lower part of the melnber K facilitates the vaporiziug of the fuel fed into the carliupeting chamber by the fuel-feeding nozzle.

W'ithin the upper end of the upper and Adian'wtrically larger portion ofthe carhuret ing:y cluunber is arranged` the usual throttle-ralre L tor coiu'rolling thc passage upwardly from or out of said chamber of the combustible and vexplosive air-andfuel mixtureiforu'ied in said chamber; The valve LV is shown open an`d`connected to and carried by a shaft i6 extending transversely and externallybf and supported from. the member and providedexternally of the f farbureting chamber with an arm 47, and upoirirstalling my improved carburetor in an .urtouiohile lsaid arnl l? is of course op vrativoly connected in any approved manner with a lnrcr (not shown) within reach of the ruueratflr.

l indicates adjustable necdle-valves arranged to regulate the discharge of fuel from the passages 20 and 21 in the fuelfeeding nozzle andlextend'ing through corresponding holes 48 formed in the lower part of the member K and threaded into and extending externally of the body Alof the carburetor, as shown in Fig. 4.

The carbureting-chamber-formingv member K is provided at one side and above the body A with@ lateral aperture' 50,V and an externally screwtl1readed tubular member 51 is screwed at said aperture into said member K. The tubular member 5,1 has a portion 52 thereof forming a bearing and external support for a sleeve P which `is arranged substantially horizontall i of' the carbureting cham r 22 and slidably mounted on and shiftable endwise of a. correspondingly arl-an ed rod 53 which extends through and beyon the'ends of said sleeve. The rod 5 3 preferably extends transversely of and through the carburetnghamber 22 and lis supported from 'the member K. 'A

valve-casing 54 'which extends' circlirhf'erenrp tially of and is arranged conc'exltrcallyrela--4 tive to the rod 53 andfsleevefffis threaded l -`at `its *inner endl f to thtublar member 51, and an airleonductingg f' from an suitable warm` irsupply `source isfthrea ed into' saidy v outer end of said casing. "iS

passagewa for supply' ll bureting4 chamber, andftllig; of said passa way forms .of said cham r, and thepsupp said passageway to saidohan l r."1`s'1j,conl trolled by a valve R arrapged'f'-" theuter direction ofthe inner endLof'thevalve-casf, .ing 54, and a helical spr1ng-f57-.is coiledh around the rod 53 and conlinedbetween said Lvalve and'a shoulder 58 formed on the adjacent normally under tension `and acts Ato retain the valve R in its closed'and normal position. The Spring 57 is arrangedtherefore internally of the val\f'c-casing 54, and the sleeve P extends from the spring through the tubular member 5l and into the carburetin g chamber a suitable distance andabuts internallfbf said chamber against two arms (l formed on and projecting upwardlyy from a collar (50 with which the upper en of an upri ht rod T arranged internally of the airc amber 10 and carbLu-eting chamber is provided. The rod T extends from the col-y ata the ,y i lpe 5531110 valve-casing 54 and the me bbryl form s the; car-f end of the sleeve. The spring 57 isy lee 10o 'fbi 'valve is seatedA v 1r 22. The y served therefore that each lar 60 downwardly to and is operatively.

connected at its lower' end v. ith the arm 34 of tliepl'ug-valve H. The collar 60 is preferably threaded onto the upper end of the rod T and therefore adjustable cndwise of the rod as desired. The members 61 connected therefore to the rod T are arranged 'at opposite sides respectively of the horizontal rod 53 and interposed between the adjacent end of the sleeve P and an annular inwardly facing shoulder 62 formed on said horizontal rod and forming an abutment for the adjacent vertically arranged surface 63 of said members 61. The horizontal rod 53 is preferably threaded adjacent its shoulder 62 into the member K of the carbureter and therefore adjustable endwise as requi .to manually adjust the sleeve-engaging members-61 and the sleeve P endwise of said rod for the purpose of` regulating the tension of the spring 57 upon theassemblage of the parts. The sleeve-engaging surface 64 of each member61 is inclined or sloping and faces u wardly, and the engaging en face 65 of t e sleeve P isinclined or slo ing 'and faces downwardly. .It will be obarm 61 f the collar 60- is wedge-shaped, and the relative arrangement of the parts is Euch that the sleeve P is actuated toward the air-supplyoontrolling valve R by the wedge-shaped members 61, or farther awayfrom said valve bg'the s'prn l57,'according greater 'sleeve as said wedgeaped mem rs are elevated or lowered by the ascent or descent respectively of the rod T. Obviously the spring 57 is placed under or less tension according as the P'is actuated toward or from the valve lR,`and therefore the tension of said trolling 4from t e spring is increased the rod T is shifted endwise in the one or the other direction. The relativearrangementof the .parts is such that the rod T 'is in its lower position when the plug-valve H or fuel-feed-oontrolling means is in the osition shown in Figs. 1 and 3, establishing communication between the carbureting chamber 22 and the duct 16 leading from the gasolene-chamber 1'1, and that elevated during the actuation of said valve or fuel-feedfcontrolling means from the position shown in Figs. 1 and 3- into the position shown in Fig. 5, and that when said valve or fuel-feed-controlling means is in the position shown in Fig. 5 not only is communication established between the carburetin chamber and the duct 16 leading kerosene-chamber 12, but the spring 57 is under greater tension than in the position of said valve or fuel-feed-conmeans shown in Figs. and 3.

It will be observed that tl air-supplycontrolling valve R is arranged and adapted to be opened by the requisite suction created within the carbureting chamber 22 dur- Amixture already said l rod is Y ing the operation of the engine, that the movement of said valve any given suction within said chamber is reduced or ir.

creased according as the spring 57 is placed under greater or less tension, and that the arm 34 ofthe plug-valve H, the rod T and its wedge-shaped members'l and the sleeve P form such a connection between the spring or yieldable means 57 and the plugvalve or fuel-feed-controlling means that the resistance offered by said s ring or yieldable means to the opening o the airsupply-controlling valve R is increased or reduced according as communicationis established by the plug-valve or fuel-feed-controlling means between the carbureting chamber and the one or the other of the dependent of t e throttle-valve L..

I would remark also that the air-supply mg passagewa' vextending thro va ve-casing 54 as that rtion of its surrounding wall which is ormed by theI een; tral orton of said casi bulging out ward y, as at 66,v Figs. 1 an vli, so as to re' sult in a whirling motion of the air conducted by said assagewa to-the carburetin chamber an thereby acilitate the commingling of said air with the air-and-fuel formed 4and 'ascending within said chamber. i I' What I claim is-f- 1. In a carbureter, the combination, with a mix' or carburetinghamber, two ductsv for con uctin fuel to fed to said cham-- ber from di erent4 fuel-supply' sources, a' fuel-feeding lnozzle arranged to discharge 1 05 -into said chamber and `comprising fuel-fee controlling'means arra and theone or the other of said ducts, and

edto

Lmeans for supplying airto said chamber adjacent s'aid nozzle, said chamber being pro-. vided at a. point spaced forwardly from said nozzle with an air-inlet, of a va ve cont llin the'supply of air to said. chamber at ,11.5 sai 'air-inlet and normally' in its closed position and arranged an adapted to be opened by the requisite suction created within said chamber, and means whereby the movement of said valve byany given suction is reduced or increased according as communication is established by the aforesaid lfuel-feed-controlling means between said chamber and the one or the-other of the aforesaid ducts.

2. In a carbureter, the combination, with a mixin or carbureting chamber, two ducts for con ucting fuel to be fed to said chamber from different fuel-supplyv sources, fuelfeed-controlling means employed in estabzii v of said.idlufdts,` a'valve controllin ,ofair tosfaid chamber at the a li'shing communication between said chamber and (he one or the other of said duct-s, means for supplying iiii' to s'aiil chamber djacent said fucl-fecdconti'olliiig means, and ii lirottle-viilvo arranged within said chambcr :ind ciiiplnycd iii controlling the passage i'i'oin said chamber of the fuel-and-air niixlnrc fnrnieil in said chamber, said cham bur liiiiiiigr iin air-inlet interiiiedintely of smul valve und the aforesaid air-supply nii-uns, of a valve coiitrollin the su ply of air lo said chamber iit siiidr lair-in et and normally in its closed position and :irrzinged nd adapted to be opened by the requisite suction created within said chamber, and means independent of the aforesaid throttle-valve and arranged and adapted to render the movement of the second-mentioned valve by a given suction j reater or less according as communication 1s established by the aforesaid fuel-feed-crgi trolling means between said chamber a Ethe one or the otherof the aforesaid ducts.

3. In a carbureten the combination, with a mixing or carbureting'chamber having an air-inlet, two ducts for conducting *fuelnto be fed to said chamber froml dierent fuel'- supplyJ'sources, fuel-feed-controlling' 'means Y i employed in establishing communication between .said chamber and the one or the dther the `supply orsaid airiiormally in itsV closed position and And' adapted to' be ropened 'by` the inem l able means acting to retain said y reduced` according as the'aforesaid fuel-feed-contro A established between 'the 'aforesa-l .means` |chamber'and"thev one or the otherrof the W1 means,

yaforesaidducts.

4. In"y a carbureter, a mixing or'carbureting chamber having a lateral air-inlet, two ducts for conducting fuel to bc fed 4to said chamber from different fuel-supply sources,` fuel-feed-contro'lling means spaced down wardlv from said air-let and employed in establishing communication between said chamber and the oneor the other of said ducts, means `for supplying air to sind' chamber ad'acent said fuele aV valve arranged to control the supply of a'irto said chamber at the aforesaid air-inlet and normally in its closed position and arranged and adapted tobe opened by the requisite 'suction created in sind. chumber, yieldablc means acting to retain said valve in its closed ositio1i,and means arran ed internally o the carbtireter and ca pab e of operation to increase or reduce the resistance offered by said yieldzible means to the opening of said valve according as two ducts' 9i' cond in iiction 'created in said chamber,-

eil-controlling the one or the other of the aforesaid ducts is selected by the aforesaid fuel-feedcontrollingr nieiins :is the passagewav from which fuel is to be fed to the aiorcsaid chamber.

I n zi 'ciiibureter`4 the coiiibiniilinn, with u inlxing or ciiibiireting chamber having an nir-inletS two ducts for conducting fuel to be fed 'to said chamber from different fuelsupply sources, fuel-feed-controlling means arriin ged und adapted to be opere ted to establish communication between said chamber and the one or theother of said ducts, :i valve controlling the supply of air to said chamber at the aforesaid air-inlet and normal'ly in closed position and arranged and adapted to'be opened by suction created 1n siiid chamber, anda sprin acting to re- 'tain said valve in its closer position, of means whereby said spring is placed under 6. In a carburetor, the'v bOml'jinaton, A,with a carbureting chamber, ii s'uita l Vsu ported rod, a valvel controlling` i said. mov bnjand movable eigse `liflsaid odg VAfd;fxio'rmiill in its c fsdend pdw beopene'dlw 'hsuction4 'insaid chamber,

rod: ri

-118 perf Miiimiof e slevejandxwungto, fam said-valve in :Supp y o air to iywbealfea to i rois its closed po's'ition, fmeans, controlled by the aforesaidoperation ofthe fuel-feedcontrolling means, for actuating the sleeve in the direction required to increase the tension of the spring, said fuel-fei-d-controlling means establishing ycommunication between the aforesaid chamber and the one or the other of th aforesaid ducts according as said sleeve is in the one or the other of its positions.

7. In a carbureter, the imbination, with a carbureting chamber; a suitable supported rod extending transversely of said chamber, a valve controlling the supply of air to said chamber and slidiibly mounted on and movable endwise of said rod and normally in its closed position and arranged and adapted to be 'opened by suctionjfcrcated in said chamber, two ducts for conducting fuel to be fed to said chamber`rom different fuel- Supply sources, and D fuel-feed-controlling means capable of operation to 'establis i coni'niunication between said chamber und the o ne or the other of" said ducts, of a sleeve mounted on and shiftable endwise of -the aforesaid rod and spaced from the I aforesaid aforesaid valve, resilient means confined between said valve vand the sleeve and under, tension in either position of the sleeve and actin position, and mechanism controlled by the operation of the fuel-feed-controlling means and arranged and'adapted to actuate the sleeve in the direction required to place said resilient means under greater ten- Y sion, or to permit said resilient means to 1,277,1va i sleeve and said valve and acting to retain the valve in its closed position, a wedge@ shaped member inte osed between the sleeve and the aforesaid shoulder and arrangd to actuate the sleeve toward the valve during movement of said wedge-shaped to retain said valve in its closed from different fuel-supply sources, fuel-feedcontrolling means capableof operation to establish communieationbetvve'en said chamber and the one or the other of v,said ducts, a valve controlling a supply of air to said chamber and'normally Ain` lts closed position and arranged and adapted tobe opened by suction created in said chamber, and a suitf ,ably supported rod extending into and loose f A relative to said valve' and havin a shoulder edlfrom and facing towar the valve,

of a sleeve mounted on 'and shiftable endwise of said rod betw'eeii'l and spaced from said valve and said shoulder,l a 'spring Vconfined between the sleeve and said valve and actingltolretain said valve its "closedy si tion,\'a ived e-shaped member' interpo `tween the s eeve andthe aforesaidshoulder and arranged to actuate'the 'sleeve vtoward 'wedgefshaped t0 thofue feed-controlling means.

the valve during movemept "of said Wedget shaped meniberendwis'e iii 'one direction,

and such a connectionlbetween said wedge-.

shaped -member andthe fuel'jfeed-control-l `that said wedge-shapedimember ling means lendwise in the one Kor the other is actuated direction by fuel-Kfeed-controllingmeans.v l

9. In a carbureter, vthe combination, with a carbureting chamber,` twofducts for conducting-fuel to be fed `tosaivdechamber from different fuel-suppl sources', -fuel-feed-controlling means capa le of operation'to establish communication between ,said chamber and the one or the other ofgsaid ducts, aA

valve controlling a supply of air tosai'd chamber and normally in its closed positionv and-arranged and adapted to beopened by suctioncreated iii-said chamber, of 4a suitably supported rod extending into and loose relative to said'valve and having a shoulder spaced from and facing the valve, a sleeve. mounted on and sliiftable endwise of said rod between and spaced from :said valve and said shoulder, a spring confined between the Ythe required operation of the- Inember endwise in one direction, and suoli a connection between said wedge-shaped member and the fuelfeedcoritrolling means that said wedge-shaped member is actuated endwise in the one or the other direction by the required operation of the fuel-feed-controlling means, the aforesaid rod being adjustable endwise.' l

10. ln a carbureter, the combination, with a carbureting chamber having a lateral airi inlet, two 'ducts for conducting fuel to be fed to said chamber from dilereni;v fuel-supply sources, fuel-feed-controlling means capable of operation toestablish communication between said chamber and theone or the other of said duets, asuitably. sup orted rod extending through said air-in et and transversely of said chamber, and a valve controllin the supply of air to saidchamber at sai air-inlet and mounted on and movable endwise of said rodl and nc'rmally inuits': closed positio said rod'having a shoulder f spaced from vt" e valve'in the direction in which the valve moves inl opening and fac` y ing toward the valve, of a sleeve mountedonff 4 andl shiftable endwisejof said rod betweenQ i and spaced -from' said valve1 and said shoulder, a spring conined Vbetween. said valve I 'and' the sleeve and acting to retain'said valve in its closed position, a viredge-ahape'dinem#v y Aber interposed between the sleeve-andthe l aforesaid shoulder, and an endivise shiftable'f. rod operatively connected' at one e'nd to'said member and at its otherfend p11. In a carburetemthe combination, a carbureting chamber having a lateral air- -inlet, two ducts for conducting-fuel to be fed to said chamber from A different fuel-sup lyV sources, `fuel-feed-controlling means capa le of operation to establish communication bev tweensaid chamber and the one or the other lof said ducts, a suitably sup orted rod extending through said air in et andvtransversely of said chamber andprovided inter ioo y l I 'nally of said chamberwith a shoulder fac-QA Vin in the direction of said air-inlet, Iand a va ve controlling the supply of air to saidl chamber 'atsaid air-inlet and mounted on' andpmovable endwise .of'said rod and normally closed and arranged and adapted to be opened by suction created in said cham'- ber, of a sleeve mounted on and shiftable endwise of said rod between said valve and the aforesaid shoulder, resilient meanskoonfined between said valve andthe sleve and acting to retain 'said valve in its closed position, an endwise shiftable rod operatively connected at one end vto the fuel-feed-conizq trolling means, and a collarthreaded onto the other end ofthe last-mentioned rod and having two wedge-shaped members arranged at opposite sides respectively of the first- 4mentioned rod and interposed between the p sleeve and the aforesaidv shoulder.

12. In a carbureter, an upright tubular.

member which nhas its lower part diametrically smaller than its upper part and terminatlng in a downwardly flaring portion forming the surrounding wall lof the upper end-portion of an air-chamber and forms a `carbureting chamber havinga lateral air- `inlet arranged above said air-chamber, a

valve controlling the supply of air to said carbureting chamber at saidy air-inlet and normally closed and arranged and adapted to be opened by suction created in the carbureting chamber, a spring actin to retain said valve in its closed position, a y which surrounds the lower part of the aforesaid tubular member and .participates in the'formation of the aforesaid air-chamber and's' provided with two fuel-chambers arranged controllin externally of and extending above said airf chamber, two ducts forming outlets the one for one of the fuel-chambers and the other for the other fuel-chamber, fuel-feed-controlling means capable of operation to establish communication between the carbureting chamber and the one or the other of said ducts, means for supplyin air to the aforesaid air-'chamber from be ow the fuel-feedmeans, and means whereby the tension o the aforesaid spring is increased op. reduced accordin as the aforesaid operation of the fueleed-controlling means establishes communication between the oarbureting chamber and the on'e or the other of the aforesaid ducts.

In testimony whereof I sign the foregoing specification in the presence of two witnesses.

HARRY H. BAER. 

